<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <h2>a元素所在的网页</h2>
  <iframe src="./other/a元素所在的网页.html" frameborder="1" width="800" height="600"></iframe>
  <hr>
  <h2>iframe元素所在的页面</h2>
  <iframe src="./other/iframe元素所在的页面.html" frameborder="1" width="800" height="600"></iframe>
</body>

</html>